Hydrochloric Acid → Methyl 2-(2-chlorophenyl)-2-((2-(thiophen-2-yl)ethyl)amino)acetate hydrochloride

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Reaction Steps

In 40 ml of methanol under cooling 11.5 ml (0.215 mol) of 100% sulfuric acid is dissolved, the solution is heated under reflux conditions for 30 minutes, then after cooling, to room temperature 12.4 g (0.042 mol) of dextrorotatory [2-(2-thienyl)ehylamino](2-chlorophenyl)acetamide is added and the mixture is heated under reflux for 6-7 hours, till the end of the reaction. Methanol is distilled off in vacuo, to the residue 75 ml of 1,2-dichloroethane and 75 ml of water are added, the mixture is shaken well and the phases are separated. The aqueous phase is extracted with 2×20 ml of 1,2-dichloroethane, the unified organic phase is extracted with 50 ml of 5% sodium hydroxide solution then with 50 ml of water, dried over anhydrous sodium sulfate. The drying material is filtered off and 1.5 g (0.041 mol) of dry hydrogen chloride gas is introduced under cooling into the solution. The precipitated crystalline product is filtered off, washed with 1,2-dichloroethane and dried. Weight: 12.1 g, mp.: 185-186° C. (decomposition), [α]22D=+107°. Yield: 83%. Optical purity: in general 99-100%.

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